Abstract
Constitutive analysis for hot working of Ti–6Al–4V alloy was carried out utilizing experimental stress–strain data from isothermal hot compression tests, in a wide range of temperatures (1073–1323K), strains (0.1–0.5) and strain rates (0.0005–1s−1). A modified constitutive equation based on multiple nonlinear regression (DMNR) has been established considering the independent effects of strain, strain rate, temperature and their interrelation. A comparative study has been made on the capability of strain-compensated Arrhenius-type Constitutive Model (SACM), orthogonal experiment and Variance Analysis Constitutive Model (OVCM) and DMNR model. Suitability of these models was evaluated by comparing the correlation coefficient, average absolute relative error and statistical analysis. It is observed that the OVCM is not suitable in providing good description of flow behavior of Ti–6Al–4V alloy in the above hot working domain. Predictions of the other two models are in close agreement with the experimental data. However, the DMNR model was based on the test data scatter plot which did not need a specific constitutive form in advance and had a lower standard deviation. It indicates that the developed constitutive equation considering the coupling effects among strain, strain rate and deformation temperature can predict flow stress of Ti–6Al–4V alloy with good correlation and generalization.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
